目录
抽象运算类
/**
* 运算类
*/
public abstract class Operation {
private double numberA = 0;
private double numberB = 0;
public double getNumberA() {
return numberA;
}
public void setNumberA(double numberA) {
this.numberA = numberA;
}
public double getNumberB() {
return numberB;
}
public void setNumberB(double numberB) {
this.numberB = numberB;
}
public abstract double getResult() throws Exception;
}加法实现类
/**
* 加法
*/
public class OperationAdd extends Operation{
@Override
public double getResult() {
double result = 0;
result = getNumberA() + getNumberB();
return result;
}
}减法实现类
/**
* 减法
*/
public class OperationSub extends Operation{
@Override
public double getResult() {
double result = 0;
result = getNumberA() - getNumberB();
return result;
}
}乘法实现类
/**
* 乘法
*/
public class OperationMul extends Operation {
@Override
public double getResult() {
double result = 0;
result = getNumberA() + getNumberB();
return result;
}
}除法实现类
/**
* 除法
*/
public class OperationDiv extends Operation {
@Override
public double getResult() throws Exception {
double result = 0;
if(getNumberB()==0)
throw new Exception("除数不能为0.");
result = getNumberA()/getNumberB();
return result;
}
}
简单工厂类
/**
* 简单运算工厂类
*/
public class OperationFactory {
public static Operation createOperate(String operate){
Operation oper = null;
switch (operate){
case "+":
oper = new OperationAdd();
break;
case "-":
oper = new OperationSub();
break;
case "*":
oper = new OperationMul();
break;
case "/":
oper = new OperationDiv();
break;
}
return oper;
}
}客户端代码
public class TestMain {
public static void main(String[] args) throws Exception {
Operation oper = OperationFactory.createOperate("+");
oper.setNumberA(1);
oper.setNumberB(2);
double result = oper.getResult();
System.out.println(result);
}
}